package cn.tedu.v5;

import java.io.*;
import java.net.ConnectException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;



public class Client {
    private Socket socket;
    private static final String HOST="127.0.0.1";
    private static final Integer PORT=4545;
    private PrintWriter pw;
    private BufferedReader br;
    public Client() {
        try {
            socket=new Socket(HOST,PORT);
            br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
            pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
        } catch (NullPointerException e){
            System.out.println("友情提示：IP传入错误导致链接失败~");
        } catch (UnknownHostException e){
            System.out.println("友情提示：IP传入错误");
        } catch (ConnectException e){
            System.out.println("客户端链接失败：建议检查IP或者端口号");
        } catch (IOException e) {
            System.out.println("客户端链接服务器失败，提示：检查IP/端口");
        }
    }
    public void start(){
        System.out.println("~~~欢迎使用小猫牌QQ聊天室");
Scanner input=new Scanner(System.in);
        //与服务器端交互---参考Server
        try {
            //1.读入服务器端：“请输入用户名”
String serverMessage=br.readLine();
//1.1显示“请输入用户名‘”
            System.out.println(serverMessage);
            //1.2写出用户名
            String username=input.nextLine();
            //1.3用户输出的用户名--写出给服务器端
            pw.println(username);
            //2.1读入服务器端发来“请输入密码”
            serverMessage=br.readLine();
            System.out.println(serverMessage);
            //2.2用户输入--密码---写出给服务器端
            String password=input.nextLine();
            pw.println(password);
            //3.登录之后【登录成功，登录失败】--才可以聊天
            serverMessage=br.readLine();//读入【登录成功，登录失败】
            //字符串方法：startWith()返回值 boolean 前缀名称一致true
            if(serverMessage.startsWith("登录成功")){
                //封一个客户端的：读写流--chat聊天
                chat();
            }

        }catch (IOException e){
            System.out.println("客户端断开链接了");
        } finally {
            if(br!=null)
                try {
                    br.close();
                } catch (IOException e) {
                    System.out.println("客户端关闭失败~");
                }
            if(pw!=null)
                pw.close();
            if(socket!=null&&!socket.isClosed())
                try {
                    socket.close();
                } catch (IOException e) {
                    System.out.println("通讯关闭失败~");
                }
        }
    }
    //封装一个针对聊天功能：读写 chat()
    private void chat(){
        new Thread(()->{
            try {
                String message;
                while((message=br.readLine())!=null){
                    System.out.println("服务器端说：" +message);
                    System.out.println("客户端请输入：");
                }

            } catch (IOException e) {
                System.out.println("服务器端读入失败！");
            }
        }).start();
        Scanner input=new Scanner(System.in);
        while(true){
            System.out.println("客户端请输入：");
            String line=input.nextLine();
            pw.println("客户端说："+line);
            if (line.equalsIgnoreCase("exit")) {
                pw.println("exit");
                break;
            }
        }
    }
    public static void main(String[] args){
        new Client().start();
    }
}
